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RPDA 4AN 21/2” – 6”

RPDA 4AN 21/2” – 6”. Modification Overview. Production of the RPDA 4AN series began in 2008. The 4AN indicates an “N” shaped pattern. The RPDA 4AN can utilize either a Type I or Type II bypass. A Lead free version (4ALF) was introduced in 2011. Check Cover Removal.

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RPDA 4AN 21/2” – 6”

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  1. RPDA 4AN21/2” – 6”

  2. Modification Overview • Production of the RPDA 4AN series began in 2008. • The 4AN indicates an “N” shaped pattern. • The RPDA 4AN can utilize either a Type I or Type II bypass. • A Lead free version (4ALF) was introduced in 2011.

  3. Check Cover Removal • Cover is secured by a V-band clamp and o-ring sealed. • To remove clamp, loosen lock nut until the latch can be disengaged from the T-bolt. • Cover has no spring load. • A flat screwdriver will help pry the lid from the body.

  4. Check Valve Removal • Check valve modules are secured by a spacer and o-ring sealed. • Remove the spacer from the body. • Pull the module straight out of the body.

  5. Check Disc Replacement • Remove the lock nuts and the retaining plate on the back of the module. ** Do not remove any hardware from the spring side of the module. • Separate the disc retainer from the module.

  6. Check Seat Removal • The check seat is part of the check module and can not be removed. • If the seat is damaged, the complete check module will need to be replaced.

  7. Check Valve Reassembly Notes • Reassemble check modules in reverse order. • Do not over tighten the lock nuts.

  8. Check Valve Reassembly • Lubricate check o-rings. • Push modules straight into body. • Insert spacer into body. • Replace access cover.

  9. RV Cover Removal • Cover is secured by a V-band clamp and sealed by the diaphragm. • Remove sensing line. • To remove clamp, loosen lock nut until the latch can be disengaged from the T-bolt. • Pull cover from body.

  10. RV Stem Removal • Remove the RV module by grasping the diaphragm plate and pulling straight out of the body.

  11. RV Seat Removal • The seat is pushed into the body and o-ring sealed. • Simply pull the seat straight out of the body.

  12. RV Disc Replacement • Holding the module in one hand, remove the bolt and washer. • Remove the seat disc.

  13. Disassemble RV Module • Module is spring loaded. • Holding the diaphragm plate firmly, remove the retaining bolt.

  14. Disassemble RV Module • Remove the bushing from the stem. • Remove the stem o-ring.

  15. RV Reassembly Notes • Replace and lubricate o-rings. • Reassemble in reverse order. • Push module straight into body. • Make sure the outer edge (bead) of the diaphragm fits into the groove on RV body.

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